Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a53d542219cf5e…

MALICIOUS

PDF

73.0 KB Created: 2021-03-11 15:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ea121b50a789cc628492e03a0c643b31 SHA-1: 8944ac92017a7102318067d741dab7d4b915cc39 SHA-256: 83a53d542219cf5e650fb5d36bf7e176891e258a86404b5a8257f66eb8a3e4ed
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/123?utm_term=complete+subject+and+predicate+worksheet+3rd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fd3067789526.pdfIn PDF document text
    • http://adyga.site/428257102064sknm.pdfIn PDF document text
    • http://health2health.online/40556582861l67ql.pdfIn PDF document text
    • http://koolmaxt.online/drawing_book_for_adults_amazonqbybl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367000/normal_5fdd2edc9a648.pdfIn PDF document text
    • http://onlinekartiadesi.com/89254801050b3jb8.pdfIn PDF document text
    • http://zootime.store/dd_wrt_router_modemkuugn.pdfIn PDF document text
    • http://idealicait.site/minecraft_1.8.8_xrayokk84.pdfIn PDF document text
    • http://cosmosqrab.online/answer_key_of_maths_10_cbse_2018i0b61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_600a1ce3d323c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somamere/aashiqui_2_all_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/julokeretisofatetiwerut.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_b52ee302406b4f56bdc57c156d26e079.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_af2b23b32351402f9b8d6f47acce542f.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_d7c33c12f4024c75b7c59f4d15dd4e3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/95019679686.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/88090194051.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_9617d463d55e4a1f8566613d5b75a137.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/busafinibe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 5928 bytes
SHA-256: 29639044f2356a9b5ae3da4312d40481fbae13b6b8433c24830632c0585c8628
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10468 bytes
SHA-256: dace712db048b529ca08b5c7ec8ad0fc6f7d26a577bf5bb19cbbc0960f9e8d0d

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